change to compile with Java 7 since spark project references it
change to compile with Java 7 since spark project references it

rashidaligee/kylo,rashidaligee/kylo,peter-gergely-horvath/kylo,claudiu-stanciu/kylo,claudiu-stanciu/kylo,Teradata/kylo,claudiu-stanciu/kylo,Teradata/kylo,claudiu-stanciu/kylo,Teradata/kylo,Teradata/kylo,rashidaligee/kylo,Teradata/kylo,claudiu-stanciu/kylo,peter-gergely-horvath/kylo,peter-gergely-horvath/kylo,peter-gergely-horvath/kylo,rashidaligee/kylo